SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 12: Poster I

A 12.19: Poster

Tuesday, March 7, 2023, 16:30–19:00, Empore Lichthof

Detecting the external magnetic field alignment using the vortex light atom interaction. — •Shreyas Ramakrishna^1,2,3, Riaan P Schmidt^4,5, Anton A Peshkov^4,5, Andrey Surzhykov^4,5,6, and Stephan Fritzsche^1,2,3 — ¹Helmholtz Institute Jena, Frobelstieg 3, D-07749 Jena, Germany — ²GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Planckstrasse 1, D-64291, Germany — ³Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universitat Jena, Max-Wien-Platz 1, D-07743 Jena, Germany — ⁴Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig, Germany — ⁵Institut für Mathematische Physik, Technische Universität Braunschweig, D-38106 Braunschweig, Germany — ⁶Laboratory for Emerging Nanometrology, Langer Kamp 6a/b, 38106 Braunschweig, Germany

We analyze photoexcitation of atoms by cylindrically polarized Bessel beams in the framework of density matrix theory based on the Liouville-von Neumann equation. In particular, we study the dependence of the population of excited atomic states on the direction of the external magnetic field for the case of the (5s ²S_1/2 (F=1) → 5p ²P_3/2 (F=0)) electric dipole transition in ⁸⁷Rb. Moreover, we demonstrate that the steady-state excited-state population is very sensitive not only to the polarization and OAM of the incoming light field, but also to the position of the atom within the beam cross-section. The results of our calculations agree well with the experimental findings of F. Castellucci et.al [Phys. Rev. Lett. 127, 233202 (2021)] and can be useful to plan future measurements.